Through-thickness temperature gradients in double-layered magneto-optical media for direct overwrite

The effect of through-thickness temperature gradients in thin films irradiated by short laser pulses is described, together with its application to direct overwrite. We found by simulation that through-thickness temperature gradients become substantial when a medium is irradiated by short laser puls...

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Bibliographic Details
Published in:Applied physics letters 1990-07, Vol.57 (2), p.105-107
Main Authors: OHTSUKI, T, OWA, S, YAMADA, F
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
Wave optics
Wave propagation in random media
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Summary:The effect of through-thickness temperature gradients in thin films irradiated by short laser pulses is described, together with its application to direct overwrite. We found by simulation that through-thickness temperature gradients become substantial when a medium is irradiated by short laser pulses of the order of 1 ns which is the characteristic time of heat diffusivity. This effect qualitatively explains why in writing experiments on a double-layered medium short pulses expand the laser power range for a writing process.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.103957